Symbol’s value as variable is void: helm--setup-source in Emacs 29.1

[notetiene]

In Emacs 29.1 (well 29.0.50), installing and executing helm-recoll gives the following error:

Symbol’s value as variable is void: helm--setup-source

This is because defmethod is not properly defined (and sadly obsolete). In order to make Emacs works, we need to add:

(require 'eieio-compat)

as is written in NEWS (29.1):

You need an explicit '(require 'eieio-compat)' to use 'defmethod' and 'defgeneric' (which have been made obsolete in Emacs 25.1 with 'cl-defmethod' and 'cl-defgeneric'). Similarly you might need to '(require 'eieio-compat)' before loading files that were compiled with an old EIEIO (Emacs<25).

I've submitted #21 in order to fix this issue.

Thanks